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參數(shù)資料
| 型號： | MC68HC05SU3AP |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 14/80頁 |
| 文件大?。?/td> | 328K |
| 代理商： | MC68HC05SU3AP |
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MC68HC05SU3A
MOTOROLA
2-3
PIN DESCRIPTIONS
2
2.2.1
Crystal Oscillator
The circuit in Figure 2-1(a) shows a typical oscillator circuit for an AT-cut, parallel resonant crystal.
The crystal manufacturer’s recommendations should be followed, as the crystal parameters
determine the external component values required to provide maximum stability and reliable
start-up. The load capacitance values used in the oscillator circuit design should include all stray
capacitances. The crystal and components should be mounted as close as possible to the pins for
start-up stabilization and to minimize output distortion. An external start-up resistor of
approximately 10M
is needed between OSC1 and OSC2 for the crystal type oscillator.
2.2.2
External Clock
An external clock from another CMOS-compatible device can be connected to the OSC1 input,
with the OSC2 input not connected, as shown in Figure 2-1(b).
Figure 2-1 Oscillator Connections
OSC1
OSC2
25p
10M
VDD
OSC1
OSC2
External Clock
Unconnected
OSC1
OSC2
OSC1
OSC2
Unconnected
R
MCU
(a) Crystal or ceramic resonator connections
(b) External clock source connection
(c) RC option 1 - external resistor
(d) RC option 2 - internal resistor
TPG
19
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